ᐅ Automation of a Mechanical Ventilation with Heat Recovery (MVHR) System
Created on: 23 May 2018 17:44
H
Hausbauer1
Hello everyone,
I’m currently struggling again with the warm indoor temperatures (unfortunately, there is no mechanical ventilation with heat recovery). When I am at home, I try to ventilate vigorously whenever it is cooler outside than inside, even if the temperature difference is only 1-2°C (34-36°F). And when it’s warmer outside, everything is shaded and the windows stay closed.
This obviously pushes comfort limits. If you want to stay in a room, ventilating at the same time is not always very comfortable. Also, you don’t want to leave the windows open all day when you’re not at home or when it gets warmer as the day goes on.
My question to all experts and owners of centralized ventilation systems is: can a mechanical ventilation system be programmed to operate exactly like the rational ventilation behavior you would do manually? So, no ventilation when it’s warmer outside and strong ventilation when it’s cooler outside. Of course, without heat recovery in this case. In winter, it would be different, with ventilation mainly during the day when temperature differences are smaller, and less or no ventilation at night when it’s very cold outside.
I think it’s clear what I’m getting at. Can these systems be automated to that extent, or is that too much to expect?
Thanks.
I’m currently struggling again with the warm indoor temperatures (unfortunately, there is no mechanical ventilation with heat recovery). When I am at home, I try to ventilate vigorously whenever it is cooler outside than inside, even if the temperature difference is only 1-2°C (34-36°F). And when it’s warmer outside, everything is shaded and the windows stay closed.
This obviously pushes comfort limits. If you want to stay in a room, ventilating at the same time is not always very comfortable. Also, you don’t want to leave the windows open all day when you’re not at home or when it gets warmer as the day goes on.
My question to all experts and owners of centralized ventilation systems is: can a mechanical ventilation system be programmed to operate exactly like the rational ventilation behavior you would do manually? So, no ventilation when it’s warmer outside and strong ventilation when it’s cooler outside. Of course, without heat recovery in this case. In winter, it would be different, with ventilation mainly during the day when temperature differences are smaller, and less or no ventilation at night when it’s very cold outside.
I think it’s clear what I’m getting at. Can these systems be automated to that extent, or is that too much to expect?
Thanks.
Steffen80 schrieb:
We had one installed right away. Just preparing for it is definitely not worthwhile... Costs for us were about 10,000 EUR Is that amount just for the air conditioning, or does it include more?
H
Hausbauer16 Jun 2018 10:17I was thinking of possibly having only two exterior wall penetrations made in the living room and bedroom, so that I could easily upgrade later if needed. However, it seems you don’t consider this to be practical. I am just not sure if an air conditioning system is really necessary here due to good insulation and shading. Therefore, I would prefer not to spend money unnecessarily. But if I later find that air conditioning is useful, I would very much like to be able to add it easily.
Usually, the challenge and high costs are not caused by the exterior breakthrough, but by the installation of the conduits.
Modern houses with good insulation perform excellently in winter. This works perfectly. However, the laws of physics cannot be reversed, and in summer, the insulation offers very little benefit. In fact, it does the same as in winter—retaining heat—which then enters through the windows and roof.
Modern houses with good insulation perform excellently in winter. This works perfectly. However, the laws of physics cannot be reversed, and in summer, the insulation offers very little benefit. In fact, it does the same as in winter—retaining heat—which then enters through the windows and roof.
Based on experience, I can confirm that just a few openings are definitely not enough.
We immediately installed air conditioning in the bedroom and the office.
There are quite a few things to consider, and it shouldn’t be done hastily.
Our costs were around €4,500 (approximately $4,900) including everything.
I have been using the system for a few days now and I’m really relieved.
What really annoys me, however, is the power consumption in standby mode. The indoor units are powered by the outdoor unit, which is connected to a KNX power meter.
I happened to discover that the system consumes about 45 W in standby mode!
That’s roughly 1.1 kWh per day, or about 10% of our total electricity usage.
I’ve been looking for the biggest power consumers for quite a while, because in my opinion we use too much electricity, but this really takes the cake.
It’s apparently not uncommon and often related to a so-called oil sump heater.
I will now always completely disconnect the system from power when it’s not needed.
Yesterday, I had the same power consumption as on previous days, even though the system was running for 4 hours. An absolute outrage.
For cost reasons, we left out air conditioning in the children’s rooms and the living/dining area, although the latter can easily be retrofitted, and the children could move to the office to sleep if necessary.
We immediately installed air conditioning in the bedroom and the office.
There are quite a few things to consider, and it shouldn’t be done hastily.
Our costs were around €4,500 (approximately $4,900) including everything.
I have been using the system for a few days now and I’m really relieved.
What really annoys me, however, is the power consumption in standby mode. The indoor units are powered by the outdoor unit, which is connected to a KNX power meter.
I happened to discover that the system consumes about 45 W in standby mode!
That’s roughly 1.1 kWh per day, or about 10% of our total electricity usage.
I’ve been looking for the biggest power consumers for quite a while, because in my opinion we use too much electricity, but this really takes the cake.
It’s apparently not uncommon and often related to a so-called oil sump heater.
I will now always completely disconnect the system from power when it’s not needed.
Yesterday, I had the same power consumption as on previous days, even though the system was running for 4 hours. An absolute outrage.
For cost reasons, we left out air conditioning in the children’s rooms and the living/dining area, although the latter can easily be retrofitted, and the children could move to the office to sleep if necessary.
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